My guess is Ukraine can intercept and triangulate the signals that the drones transmit.
The actual cost of these recon drones is not the issue, but the capability to send target locations are.
The sooner a good response to them is found the better it will be
War is always measures vs counter measures vs counter-counter measures
I love history”not Putins version”, and used to be a builder of models
Remember setting up a 1/72 scale diorama and the mk1 tanks of Germany weighed less than later models turrets alone.
The panzer Faust like todays javelins and now drones have made the tank much more vulnerable and drones have largely removed one of the age old issues of warfare, where is the enemy
Side note, much has been made of Russian artillery advantage and it is real, but when I see farm fields massively pot marked with craters I think, what a waste I highly doubt those fields were filled with anything.